Island



UNITE Sra'rns ATEN Fr es.

FREDERICK W. SEABURY, OF PROVIDENCE, RI-IODE ISLAND.

DENTAL FLASK.

SPECIFICATION forming part of Letters Patent No. 283,928, dated August28, 1883.

Application filed June 9, 1883- (No model.)

T at whom it may concern.-

Be it known that I, FREDERICK W. SEA- BURY, of the city and county ofProvidence, State of Rhode Island, have invented a new and usefulImprovement in Dental Flasks; and I hereby declare the following to be afull, clear, and exact description of the same, reference being had tothe accompanying drawings, forming part of this specification.

This invention has reference to an improve ment in dental flasks; and itconsists in the peculiar and novel construction of the flask by whichlocking-pins are placed at one side of the dowel-pins or guides, so thatwhen the cope or upper part of the flask is forced onto the nowel orlower part of the flask the locking-pins may be forced into place, andthereby lock the flask.

The invention also consists in forming dovetails onto the top and bottomplates of the flask for the purpose of holding the same in place, aswillbe more fully set forth hereinafter.

Figure 1 is a front view of a dental flask provided with thelocking-pins and the dovetail. Fig. 2 is a side view of a dental flask,showing the position of the locking-pin and the bottom plate providedwith the dovetailsin section.

In the drawings, A is the cope or upper part of the flask. B isthe'nowel or lower part of the flask. O is an oblique guide-pin insertedinto holes formed in the projections D D on the flask. E E are thelockingpins inserted in the holes formed in the projections a a at anangle opposite to those formed in the projections D D, as is shown inFig. 2.

In locked flasks it is also desirable that the top and bottom platesshould be held in place duringthe process of vulcanization and while theflask is being handled in placing it into and taking it out of thevulcanizer. For that purpose I form the dovetails b and c on the plates0 and f, as is shown in Fig. 1, so that when the plaster-of-paris F, inwhich the mold is formed, has set it will firmly hold the top and bottomplates and prevent them from being moved in any direction until it isdesirable to place new plaster into the flask and form a new mold, whenthe old plaster is removed by allowing the flask to soak in water untilthe plaster softens, when the plates may be readily detached from thecope and nowel and the plaster broken out from the flask. By thisarrangement for locking the two parts of 5 5 a dental flask together andof holding the plates in position, a dentist may have several flasksready to be placed in the vulcanizer, and as one flask is taken outanother may be placed therein without danger of moving the top or lowerpart of the flask, and thereby injuring his work.

Having thus described my invention, I claim as new and desire to secureby Letters Patent- 1. In a dental flask, the combination, with the pinsor guide-pins by which the cope is held in place, of the locking-pins EE, constructed to securely lock the two parts of the flask together, asdescribed.

2. The combination, with the obliquely-set guide-pins O O, of thelocking-pins E E, placed at such angle as will hold the two parts of theflask together when inserted, as described.

3. The combination, with the flask A and B, of the platese and f,provided with dovetail projections constructed to enter the flask andsecure the plates, as described.

FREDERICK IV. SEABURY.

' IVitnesses:

J. A. MILLER, Jr., M. F. BLIGH.

